Hero perhaps half involved in wrestling (6)
I believe the answer is:
nelson
This clue might be a double definition.
'hero' is the first definition.
(I've seen this before)
'half involved in wrestling' is the second definition.
The definition suggests a singular noun which matches the answer.
'perhaps' is the link.
Can you help me to learn more?
(Other definitions for nelson that I've seen before include "British admiral, d. 1805" , "Hero of Trafalgar Square" , "... famous admiral" , "Lady Hamilton's seafaring lover" , "Victorious flag officer" .)